SHAFT-HUB CONNECTION FOR A TRANSMISSION

Abstract

A shaft-hub connection for a planetary transmission includes a shaft, a hub element surrounding an outer circumference of the shaft and drivingly connected to the shaft for rotation about a main rotation axis via splines, a housing element fixed with respect to the main rotation axis, and an oil channel extending in the housing element and the hub element and designed to open out in a region of the splines to supply at least the splines with lubricating oil for oiling. The oil channel forms between the housing element and the hub element a lubrication gap for transferring lubricating oil and extends radially from inside outwards in a region of the lubrication gap.

Claims

1.-15. (canceled)

16. A shaft-hub connection for a planetary transmission, the shaft-hub connection comprising: a shaft; a hub element surrounding an outer circumference of the shaft and drivingly connected to the shaft for rotation about a main rotation axis via splines; a housing element fixed with respect to the main rotation axis; and an oil channel extending in the housing element and the hub element and designed to open out in a region of the splines to supply at least the splines with lubricating oil for oiling, said oil channel forming between the housing element and the hub element a lubrication gap for transferring lubricating oil and extending radially from inside outwards in a region of the lubrication gap.

17. The shaft-hub connection of claim 16, further comprising a transmission housing designed to receive the shaft-hub connection, said housing element being formed as an end-side housing cover of the transmission housing.

18. The shaft-hub connection of claim 16, wherein the housing element sits radially inside the hub element.

19. The shaft-hub connection of claim 16, further comprising a coating of sliding material applied to an inner circumferential surface of the housing element or to an outer circumferential surface of the hub element.

20. The shaft-hub connection of claim 16, further comprising a bushing arranged between the housing element and the hub element, said lubrication gap being formed between the bushing and the hub element.

21. The shaft-hub connection of claim 20, wherein the bushing comprises a radial bore, preferably a plurality of radial bores dispersed about a circumference of the bushing, to enable lubricating oil to flow via the bushing from the housing element into the hub element.

22. The shaft-hub connection of claim 20, wherein the bushing is held for conjoint rotation on the housing element.

23. The shaft-hub connection of claim 21, wherein the bushing includes a circumferentially extending oil groove on an inner circumferential surface of the bushing and/or on an outer circumferential surface of the bushing, said radial bore lying in an axial plane with the oil groove.

24. The shaft-hub connection of claim 21, wherein the hub element has an inner circumferential surface formed with a circumferentially extending oil groove, said oil groove lying in an axial plane with the radial bore of the bushing.

25. The shaft-hub connection of claim 16, wherein the oil channel is routed in the housing element or in the hub element through an aperture bore.

26. The shaft-hub connection of claim 16, wherein the oil channel opens out in the hub element via an axial course in the region of the splines or the oil channel opens out in the hub element via a radial course in the region of the splines.

27. The shaft-hub connection of claim 16, wherein the shaft and the hub element bear against each other via a pair of axial contact surfaces, said oil channel opening out in an axial region between the splines and the pair of axial contact surfaces.

28. A transmission, comprising: a planetary stage; a hub element drivingly connected to the planetary stage; and a drive connection provided between a plurality of planetary stages and/or between the planetary stage and the hub element and designed as a shaft-hub connection, the shaft-hub connection comprising a shaft having an outer circumference surrounded by the hub element and drivingly connected to the shaft for rotation about a main rotation axis via splines, a housing element fixed with respect to the main rotation axis, and an oil channel extending in the housing element and the hub element and designed to open out in a region of the splines to supply at least the splines with lubricating oil for oiling, said oil channel forming between the housing element and the hub element a lubrication gap for transferring lubricating oil and extending radially from inside outwards in a region of the lubrication gap.

29. A drive train, comprising: a transmission comprising a planetary stage, a hub element drivingly connected to the planetary stage, and a drive connection provided between a plurality of planetary stages and/or between the planetary stage and the hub element and designed as a shaft-hub connection, the shaft-hub connection comprising a shaft having an outer circumference surrounded by the hub element and drivingly connected to the shaft for rotation about a main rotation axis via splines, a housing element fixed with respect to the main rotation axis, and an oil channel extending in the housing element and the hub element and designed to open out in a region of the splines to supply at least the splines with lubricating oil for oiling, said oil channel forming between the housing element and the hub element a lubrication gap for transferring lubricating oil and extending radially from inside outwards in a region of the lubrication gap; a shaft which is torque-transmittingly connected to the transmission; and a machine which is torque-transmittingly connected to the transmission.

30. A wind turbine, comprising: a nacelle; the drive train of claim 29; a multi-blade rotor arranged on the nacelle for rotation and torque-transmittingly connected to the drive train.

Description

[0021] The invention is explained below by way of example with reference to the accompanying drawings using preferred exemplary embodiments, wherein the features presented below can each represent an aspect of the invention both individually and in combination. It is shown in:

[0022] FIG. 1: a structural set-up of a shaft-hub connection;

[0023] FIGS. 2 to 4: a first, second and third embodiment, with a bushing sitting between housing element and hub element;

[0024] FIG. 5: another embodiment without a bushing between housing element and hub element;

[0025] FIGS. 6a) and 6b): views of the hub element and of the shaft;

[0026] FIG. 7: a planetary transmission in a drive train for a wind turbine, and

[0027] FIG. 8: a perspective view of a wind turbine.

[0028] In FIG. 1, a structural set-up of a possible configuration of a shaft-hub connection 10 is shown, the details of which are described below with reference to the further figures. The shaft-hub connection 10 is provided here as a drive connection between a planetary stage 6 and a spur-gear stage 8. Of the planetary stage 6, only a planetary gear carrier PT and the spline engagement of planetary gears PR with a shaft 12 are shown, the shaft 12 being designed as a sun shaft. Of the spur-gear stage 8, only a hub element 14 and a gearwheel ZR, connected to the latter for conjoint rotation, are shown. The hub element 14 is supported with respect to a transmission housing GG via a bearing arrangement L1. Axial forces introduced into the outer hub element 14 can be supported via the bearing arrangement L1. The shaft 12 is supported on the one hand via splines 16, via which the shaft 12 is drivingly connected to the externally circumferentially arranged hub element 14. On the other hand, the shaft 12 is supported indirectly via a bearing arrangement L2 of the planetary gear carrier PT in the transmission housing GG. A rotation of the shaft 12 and of the hub element 14 can take place about a main rotation axis AR. In an application in which the shaft-hub connection 10 is used, for example, in a planetary transmission for a wind turbine, a non-co-rotating pitch tube can run within the shaft 12. The hub element 14 is also designed here as a hollow shaft. The shaft 12 and the hub element 14 bear on each other via a combination of axial contact surfaces 20, 22. An axial force that is introduced into the hub element 14 during operation can be supported by way of the axial contact surfaces 20, 22.

[0029] FIG. 2 shows a detail of the end-side region of the unit consisting of planetary transmission 2 and spur-gear stage 8. This is the region facing a generator unit, although the latter is not shown. The transmission housing 3 here has a housing element designed as housing cover 42. The housing cover 42 can, for example, be screwed onto the rest of the transmission housing 3. In the structure of the housing cover 42, an oil distribution 44 is provided which is connected, for example, to an external oil pump that provides lubricating oil under pressure.

[0030] An oil channel 24 is provided, which runs from the oil distribution 44 and opens into the region of the splines 16. It is shown here that the oil channel 24 can open out in an axial region between the splines 16 and the combination of axial contact surfaces 20, 22. By way of the oil channel 24, it is first of all possible to supply lubricating oil to the splines 16 for oiling. The oil channel 24 extends from the rotationally fixed housing cover 42 to the hub element 14, which rotates during operation. A contactless bushing 26 is arranged between the housing cover 42 and the hub element 14 in order to transfer the lubricating oil. The bushing 26 has at least one radial through-hole 28. In the present case, it will be seen that the bushing 26 forms a plurality of radial through-holes 28 about the circumference. The at least one through-hole 28 ensures that the lubricating oil can flow via the bushing 26 from the housing cover 42 into the hub element 14 and that the bushing 26 simultaneously serves as a seal between housing cover 42 and hub element 14, between which a relative rotation prevails during operation. The bushing 26 is held for conjoint rotation in the housing cover 42. A lubrication gap 54 is arranged between the bushing 26 and the hub element 14. In the housing cover 42, an aperture bore 40 is provided in the oil channel 24, which aperture bore can also be designated as a tapering of the cross section and allows the oil flow to be adjusted.

[0031] FIG. 2 shows an embodiment in which the bushing 26 forms a circumferential oil groove 34.sub.1, 34.sub.2 on an inner circumferential surface 30 and on an outer circumferential surface 32, respectively. Here, the two oil grooves 34.sub.1, 34.sub.2 preferably lie in an axial plane. It will also be seen that the oil channel 24 in the hub element 14 opens out in the region of the splines 16 via a radial course.

[0032] FIG. 3 shows an embodiment in which the oil channel 24 in the hub element 14 opens out in the region of the splines 16 via an axial course. In other respects, the embodiments in FIGS. 2 and 3 correspond.

[0033] FIG. 4 shows an embodiment in which the bushing 26 forms a circumferentially extending oil groove 34 on an inner circumferential surface 30, and an inner circumferential surface 36 of the hub element 14 forms a circumferentially extending oil groove 38. In addition, the oil groove 38 here can also lie in an axial plane with the at least one radial through-hole 28 of the bushing 26. In other respects, the embodiments in FIGS. 2, 3 and 4 correspond.

[0034] FIG. 5 shows an embodiment without bushing 26. Instead, the lubrication gap 54 for transferring lubricating oil is formed directly between an inner circumferential surface 58 of the housing element 3 and an outer circumferential surface 36 of the hub element 14. In this case, a coating of sliding material can be provided, which is applied either to the inner circumferential surface 58 of the housing element 3 or to the outer circumferential surface 36 of the hub element 14.

[0035] FIG. 6 shows an axial view of the shaft 12FIG. 6a)and a perspective sectional view of the hub element 14FIG. 6b). In FIG. 6a), a contact shoulder 46 can be seen, on which the axial contact surface 20 is arranged. A plurality of radially extending oil grooves 48 are arranged on the axial contact surface 20. The plurality of oil grooves 48 are evenly distributed over the circumference of the axial contact surface 20. Here, eight oil grooves 48 are provided, the number of which may also vary. FIG. 6b) shows a contact shoulder 50 of the hub element 14, wherein the axial contact surface 22 is arranged laterally on the contact shoulder 50. A plurality of axially extending oil grooves 52 are arranged on a cylinder surface 56 of the contact shoulder 50. The plurality of oil grooves 52 are uniformly distributed over the circumference of the cylinder surface 56.

[0036] FIG. 7 shows a purely exemplary planetary transmission 2, for example for a wind turbine. A first and a second rotating planetary stage 4, 6 and a spur-gear stage 8 are mounted in succession in a transmission housing 3. In the present case, a shaft-hub connection 10 is provided as drive connection between the second planetary stage 6 and the spur-gear stage 8. It may be provided that the second planetary stage 6 is designed to rotate more rapidly in relation to the first planetary stage 4.

[0037] FIG. 8 shows an embodiment of a wind turbine 70. The wind turbine 70 comprises a nacelle 71 on which a multi-blade rotor 72 is rotatably arranged. The multi-blade rotor 72 is torque-transmittingly connected to a main shaft 74, wherein the main shaft 74 belongs to a drive train 76. The drive train 76 further comprises a planetary transmission 2, which is torque-transmittingly connected to the main shaft 74. The planetary transmission 2 has at least one planetary stage 6 and a spur-gear stage 8 and is coupled to a generator 80. In the present case, a shaft-hub connection 10 is provided as drive connection between the planetary stage 6 and the spur-gear stage 8, wherein the shaft-hub connection 10 can be configured as described above.

LIST OF REFERENCE SIGNS

[0038] PR planetary gear [0039] PT planetary carrier [0040] L1, 2 bearing arrangements [0041] ZR gearwheel [0042] GG transmission housing [0043] 2 planetary transmission [0044] 3 transmission element [0045] 4 planetary stage [0046] 6 planetary stage [0047] 8 spur-gear stage [0048] 10 shaft-hub connection [0049] 12 shaft [0050] 14 hub element [0051] 16 splines [0052] 18 end face [0053] 20 axial contact surface [0054] 22 axial contact surface [0055] 24 oil channel [0056] 26 bushing [0057] 28 through-hole [0058] 30 inner circumferential surface [0059] 32 outer circumferential surface [0060] 34 oil groove [0061] 36 inner circumferential surface [0062] 38 oil groove [0063] 40 aperture bore [0064] 42 housing cover [0065] 44 oil distribution [0066] 46 contact shoulder [0067] 48 oil groove [0068] 50 contact shoulder [0069] 52 oil groove [0070] 54 lubrication gap [0071] 56 cylinder surface [0072] 58 inner circumferential surface [0073] 70 wind turbine [0074] 71 nacelle [0075] 72 multi-blade rotor [0076] 74 main shaft [0077] 76 drive train [0078] 80 generator